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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b5376d589eef3ad99412196cee4b21d46fc26fab43b4a18872ba5138d4c69b' 
  AND token = '+oy/0xYcl6a4ai5nYuQ9qy9Rge7VvY8/+xVMR6IVcMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}